Vision goes blurry

This is something I've always struggled with. If I have a few rally shots and then decide to rush to the net, my vision goes blurry for a split of a second.
Has anyone else experienced this? Is this a sign of something? Too much adrenalin perhaps? How can I stop this?
PS: And no I'm not on drugs.

Thanks guys, quite a surprising tips. OK, I haven't got history with poor blood pressure or extremly high. I also don't wear contact lenses or have any problems with eyes. The only thing that sounds very plausible is I could be simply dehydrated at times, if that's what it can cause. To be more specific, it doesn't always happen, only sometimes. One particular case, only very recently I lost the point, 'cos I shanked a volley sitter, because my eyes went blurry. I tend to have a sip of water on every change over but in hot days and particularly when games are longer, it can be tough.

Some people develop what's called "floaters." It's something like a thickening of the vitreous humor in the eye, floating around inside your eyeballs. When it gets in the way of light, it gets fuzzy. ...I think. My parents have them but I don't.

Thanks guys, well, I'm not the youngest...51 rings the bell but I'm doing my best to stay fit. It really does sound like a dehydration to me.
My question is, are some of you making special home made drinks? I normally don't get too technical and have just water but perhaps it's not enough.
Problem is, we play extensively, though it's only once a week, every Saturday from 12:00 noon 'till 17:00. It's quite a long day of tennis.

Thanks guys, well, I'm not the youngest...51 rings the bell but I'm doing my best to stay fit. It really does sound like a dehydration to me.
My question is, are some of you making special home made drinks? I normally don't get too technical and have just water but perhaps it's not enough.
Problem is, we play extensively, though it's only once a week, every Saturday from 12:00 noon 'till 17:00. It's quite a long day of tennis.

Oh yeah, I don't have focusing problems either. (brain wise maybe )

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If it was dehydration, you will have other symptoms and the symptom will not resolve on its own.

Nah, it can be asymptomatic if it's not severe enough. So one possibility to explain what happened: five hours of tennis created enough water-loss that his body had a temporary shortage of bloodflow in the head region. Maybe the ophthalmic artery, who knows. Kinda like standing up too fast and getting lightheaded. Five hours is a very, very long time for tennis, and you have to make sure you eat/drink adequately during that time.

Once I got up too fast, and my vision was blurry for 15 seconds. Thank God I didn't faint. Remember to eat!

Nah, it can be asymptomatic if it's not severe enough. So one possibility to explain what happened: five hours of tennis created enough water-loss that his body had a temporary shortage of bloodflow in the head region. Maybe the ophthalmic artery, who knows. Kinda like standing up too fast and getting lightheaded. Five hours is a very, very long time for tennis, and you have to make sure you eat/drink adequately during that time.

Once I got up too fast, and my vision was blurry for 15 seconds. Thank God I didn't faint. Remember to eat!

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What you experienced is orthostatic hypotension, which has to do with our nerve system not regulating our blood pressure quickly enough in relation to our change in posture (from lying to standing). In dehydration, blood circulation can decrease because there is too much fluid loss, and this does not resolve until fluid has been replaced. And, dehydration is pretty serious if it's causing blurry vision, and there will definitely be other symptoms such as dizziness, increased heart rate, etc. And, these symptoms will not resolve until you replenish fluid. Simply, you feel thirsty until you drink water.

The OP stated the blurry vision lasted only momentarily and is caused when he goes upto the net to volley. This sounds more like his eyes not quickly adapting to the change rather than dehydration.

What you experienced is orthostatic hypotension, which has to do with our nerve system not regulating our blood pressure quickly enough in relation to our change in posture (from lying to standing). In dehydration, blood circulation can decrease because there is too much fluid loss, and this does not resolve until fluid has been replaced. And, dehydration is pretty serious if it's causing blurry vision, and there will definitely be other symptoms such as dizziness, increased heart rate, etc. And, these symptoms will not resolve until you replenish fluid. Simply, you feel thirsty until you drink water.

The OP stated the blurry vision lasted only momentarily and is caused when he goes upto the net to volley. This sounds more like his eyes not quickly adapting to the change rather than dehydration.

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I know what it is. They kinda taught me physiology at the medical school here. The question is whether it can occur momentarily or how short a time period it could occur. That they didn't teach me, probably because we don't know.

I don't know what it is, but the solution is simple: stay at the baseline. :cry:

I know what it is. They kinda taught me physiology at the medical school here. The question is whether it can occur momentarily or how short a time period it could occur. That they didn't teach me, probably because we don't know.

I don't know what it is, but the solution is simple: stay at the baseline. :cry:

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Hey, I also work in medicine..Got done with school a while ago.
I don't mean to lecture or anything, but it's VERY unlikely based on the description, s/s of dehydration and its progression, and etiology behind dehydration.

Hey, I also work in medicine..Got done with school a while ago.
I don't mean to lecture or anything, but it's VERY unlikely based on the description, s/s of dehydration and its progression, and etiology behind dehydration.

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I'm thinking more along the lines of a transient perfusion problem, not prolonged dehydration.

By analogy, if the heart can undergo reversible angina, (momentary reduction in blood perfusion causing chest pain), perhaps the eye can too (momentar reduction in blood perfusion leading to vision blur?). I don't know. I'm not optho.

hmm, I read all this... you just made me think and I must agree whenever i was dehydrated I felt dizzy and weak as well. It definitely didn't go away quickly. I'm not a doctor but I thought there could be perhaps a mild form of dehydration, maybe these could be telling symptoms.
The truth is, it does last for a very short moment, just when I'm about to contact the ball. Maybe the eye adaptation could take a little time, as someone suggested. I only very recently started wearing reading glasses but I also have this issue for quite some time. Strange thing is, it doesn't always happen but it will surprise me at the worst possible moment, when I least expect it.

hmm, I read all this... you just made me think and I must agree whenever i was dehydrated I felt dizzy and weak as well. It definitely didn't go away quickly. I'm not a doctor but I thought there could be perhaps a mild form of dehydration, maybe these could be telling symptoms.
The truth is, it does last for a very short moment, just when I'm about to contact the ball. Maybe the eye adaptation could take a little time, as someone suggested. I only very recently started wearing reading glasses but I also have this issue for quite some time. Strange thing is, it doesn't always happen but it will surprise me at the worst possible moment, when I least expect it.

BTW: My apology, I think this should've been in health section.

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Have you always had this problem? Does this happen almost always happen (7~8 out 10 times)?
You are at an age where accommodation (ability to change your focus between near and far) is going to slow down. Or, your eye movement is just slowing down and can't track the ball quite as well, or needs more warm up time. There are eye exercises you can do..

It must be frustrating for you, you could bring it up to your eye doctor or family doctor..?

Dehydration affects blood circulation and tissue perfusion because there is not enough "water" in our blood to be pumped. Until you replenish the water, symptoms won't go away...However, in your case, the symptoms RESOLVE while you are hitting the ball. Humans cannot live more than 2~3 days w/o water...In addition, signs of dehydration take place in certain order - thirst being the first. If dehydration reached a stage where it was affecting tissue perfusion, you will be too weak to play tennis. : )